ZERO.
Would love to price out gas/time costs versus just taking discount carrier (Spirit/Frontier).
Early morning flight on day 1 will put you in the park by evening.
Days 2-3 full days in Park
Day 4 park am with last flight out.
You get to see 4 parks.
3 nights in hotel.
Much less food bill.
Why would anyone drive 2,000 miles outside of extreme fear of air travel?